Canon MF6530 Service Manual - Page 111
Cassette Pickup Unit
UPC - 013803056037
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Chapter 7 7.3 Cassette Pickup Unit 7.3.1 Outline 0011-4052 Paper is picked up from the cassette under the control of the CPU on the DC controller PCB and using the drive of the main motor (M1). When the cassette pickup solenoid (SL2) goes ON, the drive of the main motor (M1) is transmitted to the cassette pickup roller assembly to rotate the cassette pickup roller. When the cassette pickup roller rotates, a single sheet of paper is separated from the stack by the separation claws of the cassette, and is sent as far as the registration roller by way of the feed roller. After the paper passes a registration sensor (SR11), the paper reaches the registration roller. At this time the registration roller is at rest, causing the leading edge of the paper to butt against it to form an arch. The DC controller PCB turns on the registration clutch (CL1) at specific timing to transmit the drive of the main motor to the registration roller, thereby moving the paper ahead. The paper reaches the delivery tray after moving through the transfer, separation, and fixing/delivery assemblies. The deliver tray has a delivery paper full sensor (SR10) to detect that the delivered sheets are stacked fully. When the total height of the delivered sheets reaches the specified value and the delivery paper full sensor (SR10) turns on, this machine detects occurrence of an error and displays an error message on the LCD. SR5 SR10 M1 CL1 SR11 SL2 SR9 F-7-3 7.3.2 Retry Pickup 0011-4054 If the registration sensor (SR11) does not detect paper within a specific period of time after the cassette pickup roller has started to rotate, the machine will start to rotate the cassette pickup roller once again to execute a retry pickup operation. If the registration sensor (SR11) still does not detect paper within a specific period of time after executing a retry pickup 3 times, the machine will identify the condition as a jam and will indicate a jam message on the LCD of its control panel. 7.3.3 Detecting the Size of Paper 0011-4055 The cassette paper size detection is performed using the registration sensor (SR11) based on the length of paper. In fax mode, if paper of a size different from the size selected from the control panel is placed, the DC controller will identify a paper size mismatch at the end of printing and indicate a message on the LCD. 7-3